X-Git-Url: https://git.distorted.org.uk/~mdw/adns/blobdiff_plain/bef232aebeabbef525faa7d7f5b08cf7a1427f95..0f15dd7b03058cb07e55d36ab36029081d556ffc:/src/adns.h

diff --git a/src/adns.h b/src/adns.h
index df1dede..7eaea20 100644
--- a/src/adns.h
+++ b/src/adns.h
@@ -5,7 +5,7 @@
 /*
  *
  *  This file is
- *    Copyright (C) 1997-1999 Ian Jackson <ian@davenant.greenend.org.uk>
+ *    Copyright (C) 1997-2000 Ian Jackson <ian@davenant.greenend.org.uk>
  *
  *  It is part of adns, which is
  *    Copyright (C) 1997-2000 Ian Jackson <ian@davenant.greenend.org.uk>
@@ -151,12 +151,6 @@ typedef enum {
  * names) will be quoted, as \X if it is a printing ASCII character or
  * \DDD otherwise.
  *
- * (The characters which will be unquoted are the printing 7-bit ASCII
- * characters except the punctuation characters " ( ) @ ; $ \
-
- * I.e. unquoted characters are alphanumerics, and the following
- * punctuation characters:  ! # % ^ & * - _ = + [ ] { } 
- *
  * If the query goes via a CNAME then the canonical name (ie, the
  * thing that the CNAME record refers to) is usually allowed to
  * contain any characters, which will be quoted as above.  With
@@ -179,20 +173,33 @@ typedef enum {
  * header field.  The particular format used is that if the mailbox
  * requires quoting according to the rules in RFC822 then the
  * local-part is quoted in double quotes, which end at the next
- * unescaped double quote.  (\ is the escape char, and is doubled, and
- * is used to escape only \ and ".)  Otherwise the local-part is
- * presented as-is.  In any case this is followed by an @ and the
- * domain.  The domain will not contain any characters not legal in
- * hostnames.  adns will protect the application from local parts
- * containing control characters - these appear to be legal according
- * to RFC822 but are clearly a bad idea.
+ * unescaped double quote (\ is the escape char, and is doubled, and
+ * is used to escape only \ and ").  If the local-part is legal
+ * without quoting according to RFC822, it is presented as-is.  In any
+ * case the local-part is followed by an @ and the domain.  The domain
+ * will not contain any characters not legal in hostnames.
+ *
+ * Unquoted local-parts may contain any printing 7-bit ASCII
+ * except the punctuation characters ( ) < > @ , ; : \ " [ ]
+ * I.e. they may contain alphanumerics, and the following
+ * punctuation characters:  ! # % ^ & * - _ = + { } .
+ *
+ * adns will reject local parts containing control characters (byte
+ * values 0-31, 127-159, and 255) - these appear to be legal according
+ * to RFC822 (at least 0-127) but are clearly a bad idea.  RFC1035
+ * syntax does not make any distinction between a single RFC822
+ * quoted-string containing full stops, and a series of quoted-strings
+ * separated by full stops; adns will return anything that isn't all
+ * valid atoms as a single quoted-string.  RFC822 does not allow
+ * high-bit-set characters at all, but adns does allow them in
+ * local-parts, treating them as needing quoting.
  *
  * If you ask for the domain with _raw then _no_ checking is done
  * (even on the host part, regardless of adns_qf_quoteok_anshost), and
  * you just get the domain name in master file format.
  *
  * If no mailbox is supplied the returned string will be `.' in either
- * caswe.
+ * case.
  */
 
 typedef enum {